Spring Conditions
on the Northeast Shelf Ecosystem |
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The spring indices for sea surface temperature and zooplankton
biomass on the Northeast Shelf exhibit definite trends suggesting
decadal and multi-decadal changes in these parameters. The time
trend of SST during the spring season follows a pattern similar
to the annual trend in SST for the entire shelf system; both indicate
surface waters have cooled during the past few years on the order
of 1-2°C (See
Annual Conditions of the Northeast Shelf Ecosystem). Inter-annual
variability in spring levels of chlorophyll has been large, making
it difficult to discern a shelf-wide trend. Spring zooplankton
biomass is apparently increasing. The lowest biomasses were observed
in the early 1980's, and some of the highest biomasses have been
observed in recent years. The level of increase in on the order
of 30% over the time series minima observed in the early 1980's.
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Spring
Conditions on the Northeast Shelf by Subarea
Spring Sea Surface Temperature Distribution
Spring Chlorophyll Distribution
For further information, contact:Kevin.Friedland@noaa.gov
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